Penrose triangle
Oscar Reutersvärd; independently Lionel & Roger Penrose
Three convincing corners. One impossible connection.
Impossible objects / 2025 drawing
Skew impossible quadrilateral
A skew four-sided frame changes its depth logic at the corners.
TRY THIS
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
THE IMAGE IN THIS ARCHIVE
Vectorization: Mrmw
Original file & attribution · CC BY-SA 4.0
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Download imageFrequently asked questions
What is Skew impossible quadrilateral?
A skew four-sided frame changes its depth logic at the corners.
What should I look for in Skew impossible quadrilateral?
View larger, then trace one connected edge all the way through the object. Compare the local joins with the whole shape.
What explains Skew impossible quadrilateral?
The slanted arrangement encourages a continuous loop reading. Compare the facing surfaces at each join instead of trusting the frame as a whole.
Another way to see it
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Impossible cube
M. C. Escher; modern redraw by 4C and Belbury
A familiar cube frame acquires an impossible set of overlaps.
